382         case EC_IOCTL_DATA:

   383             {

   384                 ec_ioctl_data_t data;

   385                 const ec_domain_t *domain;

   386 

   387                 if (copy_from_user(&data, (void __user *) arg, sizeof(data))) {

   388                     retval = -EFAULT;

   389                     break;

   390                 }

   391                 

   392                 if (!(domain = ec_master_find_domain(master, data.domain_index))) {

   393                     EC_ERR("Domain %u does not exist!\n", data.domain_index);

   394                     retval = -EINVAL;

   395                     break;

   396                 }

   397 

   398                 if (domain->data_size != data.data_size) {

   399                     EC_ERR("Data size mismatch %u/%u!\n",

   400                             data.data_size, domain->data_size);

   401                     retval = -EFAULT;

   402                     break;

   403                 }

   404 

   405                 if (copy_to_user((void __user *) data.target, domain->data,

   406                             domain->data_size)) {

   407                     retval = -EFAULT;

   408                     break;

   409                 }

   410                 break;

   411             }

   412